Đáp án đúng: B
Giải chi tiết:\(\begin{array}{l}\,\,\,\,\,\,\,\, - \left( {x + 84} \right) + 213 = - 16\\\,\,\,\,\,\,\, - x - 84 + 213\,\,\,\,\,\,\, = - 16\\\,\,\,\,\,\,\, - x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 16 - 213 + 84\\\,\,\,\,\,\,\, - x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 145\\\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \,145.\end{array}\)
Vậy \(x = 145.\)
Chọn B.
